Quote:
Originally Posted by Unreal
Sounds like the evap canister purging.
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Quote:
Originally Posted by hawaiizuka
Well, that something I need to figure out.
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There are 16 potential fuel trim cells for the e38.
Evap Purge On Cells;
cell 0-1 Airflow based
cell 2-5 Not used
cell 6 Idle
cell 7 Decel
Evap Purge Off Cells
cell 8-9 Airflow based
cell 10-13 Not used
cell 14 Idle
cell 15 Decel
Log the fuel trim cell you are in to see if purge is on or off. You can also use this to filter out idle or decel data. Be aware that the PCM can command any percent purge from 0-100 so how rich it runs during purge will vary. I just disconnect the evap purge line where it goes into the intake then plug the intake hole when tuning. Let the end coming from the evap solenoid unplugged to vent into the air .